Gauge mounting



C. F. BROWN GAUGE MOUNTING May 15, 1945.

Filed May 21,1943

I IN VE NTOR Mt e! 44 @142 ATTORNEY Patented May 15, 1945 i I Q a UNITED STATES PA N 4 OFFICE a v ,1 2,376,118 Iii W 7'.

,GAUGE MOUNTING Charles'F; Brown, Sharon, Massalassig nor to New England Carbide Tool Company, "Cambridge,

Mass; a corporation of Massachusetts p v Application May 21, 1943', Serial N0.487,861

This invention relates to gauge points and is In the form shown, the edge of portion I6 is snug concerned particularly with an improved mountly seated against the shoulder la in perfect coning for industrial diamonds or other hard matetact with the diamond 6. The metallic member rials, such as sapphires or boron carbide, for ex- I4 may be initially applied as an aperturedcap, ample, having convex working faces of the type 5 the edges of the aperture being spun into tight which are commonly used in such gauges. engagementwith-ythe "diamond. With such as- Wherever diamond.is hereinafter mentioned, it sembly, thespun over portion '16 of the metallic is intended "that this will include similar other member l4 seals the brazing'material 8'from exhard materials with abrasive-resistant qualities. posure, and the working face, comprising the cen- An essential object of the invention is the prolo tral diamond surface l2 and surrounding spun vision'of a simple brazed mount having a perover portion is, may be properly polished to a fectly smooth continuous working face including predetermined tolerance without any danger of the surface of the hard material, and which will loose particles becoming lodged in the high temhave no brazing material exposed thereon. perature brazing material 8. The entire working Major advantages result. First, the brazing mal5 face of the tool iscomposed of diamond and terial, which is a relatively soft metal, is never metal, with the result that the juncture between subjected in use of the gauge to thefriction wear these surfaces withstands friction wear attendant towhich the working face is subjected. Secondto the sliding of materials to be tested against ly, the Workingface of the gauge may, after final the working fa0e.- There is 1658 danger, h mounting, be polished without danger of abrasive fore, of any portion of p Circular edge o particles becoming lodged in any relatively soft t e di ond be eXpOSed y reason Wear brazing material where they might subsequently eit d ing polishing or in use than when a mar material being gauged. construction is used wherein brazing material or The mounting of this invention is illustrated other soft ate s xp d n t w rkin in the accompanying drawing embodying the facesurrounding the diamond surface, as has been holding of an industrial diamond, but I do not common heretofore. Also, the juncture between wish to confine the invention to this material, e an diamond Surfaces iS s t t and even as the method may equally well'be adapted to that no P c e can become Caught e holding other hard materials. The drawing is either during th p s n p t n or t enlarged roughly eight times, and inwhich after.

Fig. 1 is a cross-sectional view of the improved In the form shown, the working face is formed mounting; and with a uniform curvature. This particular type Fig. 2 is a working face elevation thereof, of surface has been shown as illustrative only, as

The tool comprises a, threaded shank 2, having the construction isadvantageous in any assembly a recess 4 and having in its recess a relatively wherein t is desired to form a ti us y high temperature brazing material 8 brazed to smooth working surface, and other surface forms the wall of the recess and a diamond 6 imbedded y'b usedin the brazing material and brazed thereto. As I claim: shown, the diamond 6 projects outwardly from 1. A gauge point comprising a shank and abrathe shank, and is provided with the usual, slight- 40 sion resisting tip associated with said shank and ly convex working face [2. Preferably also the having a smooth face projecting therefrom, brazdiamond has surrounding its working face l2 a ing material fastening said abrasion resisting tip circular shoulder or rabbet l8.- to said shank and a metallic cap member sur- Surrounding the shank 2 is an annular metallic rounding and fastened to said shank and having member 14 of steel or Monel metal, or other metal n end flange p n thereof extending inwardly having spinning properties, which-is fastened to over the end of said shank with the edge thereof the ha k a by brazing ith a, relatively l w in spun engagement with said abrasion resisting temperature brazing material. A projecting por-, tip and concealing Said brazing e a t e 6X- tion l6 of the metallic member I4 extends over tended portion of Said metallic p ber a d the end of shank Zand its edge is spun'into oversaid abrasion resisting tip forming a continuously lapping tight annular engagement with the diasm W king face for said p mond 6 to form a continuously smooth convex A diamond gauge Point Comprising a Shank,

working surface as Shown, t portion 5 meeting a diamond associated with said shank and having the central diamond surface in a regular, flowing v x end projecting therefrom, in meor fair curve, and without intervening crevices. 5 terial fastening Said diamond to said Shank. d

a metallic cap surrounding and fastened to said shank and having an end flange portion thereof extending inwardly over the end of said shank with the edge thereof in spun engagement with said diamond and concealing said brazing material, the extended portion of said metallic cap and said diamond forming a continuously smooth convex working face for said point.

3. A diamond gauge point comprising a recessed shank, a diamond set in the recess of said shank and having a convex end projecting therefrom, brazing material holding said diamond in said recess, and a metallic cap member surrounding and fastened to said shank and having an end portion thereof extending overthezend of-said shank with the edge thereof in spun "overlapping engagement with said diamond and concealing said brazing materiaLzthetextended:portion of said metallic member and said diamond forming a continuously smooth convex'working .facelfor :said'point composed of -a central diamond surface surrounded by .a =metallic surface constituting a'continuous extension 10f 'said'tdiamond surface.

4. A diamond gauge point having ,a convex working: face comprising 'a recessed shank,-a-.diamond-set in saidrecess and having aconvex surrface projecting therefrom, brazing-material hold- :ing said diamond in said recess, and 1a a metallic cap surrounding and fastened to said shank and having the end portion thereof extending over the end of said shank with the edge thereof in spun overlapping engagement with said diamond and concealing said brazing material, the extended portions of said cap and of said diamond forming a continuous smooth polished convex working face for said point,

5. 3A ggauge'having an end portionzpresenting a substantially spherical surface to the Work and including a diamond and circumscribing metal engaging and making a tight joint with said diamond, said spherical surface of the gauge being composed solely of the face of said diamond and .theface of said .circumscribing metal.

6. 'Agauge comprising a shank having a recess at one end, brazing material brazed in said recess,

.a diamond set into said brazing material and landhaving an inwardly projecting annular'fiange portion the inner circumference of which is set in tight spun engagement in said rabbet, the outer face 'of said flange "portion :being convex and forming with the convex face of :said diamond a smoothrcontinuous convex surface.

CHARLES F. BROWN. 

